Quote from -V-Max- :

A test track would be cool to setup suspension, heavy banks, bumpy roads ( really bumpy ) cobblestones ( or how do you call that middle-age roads again? ) heavy banked corners, steep hils.. Like a test track for normal road cars before they get sold..

Yes, +1 for a clone of Nardo or Millbrook

Quote from duke_toaster :

Yes, +1 for a clone of Nardo or Millbrook

+1.

What a great idea -- if you had about 50 configurations of Millbrook you possibly wouldn't even need any other tracks.